How to Jailbreak and Unlock Your iPhone 3G Using RedSn0w (Windows) [4.2.1]

Posted November 28, 2010 at 11:52pm by iClarified | Please help us and submit a translation by clicking here | 1126438 views

These are instructions on how to jailbreak your iPhone 3G on the 4.2.1 firmware using RedSn0w for Windows. The Mac version of this tutorial is here.

IMPORTANT FOR UNLOCKERSDuring this process you can update your baseband to the 06.15 version. If you are on 05.14 or 05.15 or higher you will need to do this to unlock. You do not need to do this for jailbreak only. Please read the following very carefully before deciding whether to do this.

1. There is no way to come back down from 06.15, and theres no hiding the baseband version from Apple. Youll be voiding your warranty in a very obvious way.2. If some future baseband comes out with a critical fix, you wont be able to update to it if it remains down in the 05.xx sequence (then again, you wouldnt update to it if you wanted to keep your unlock anyway).3. Starting with FW 4.2.1 if you have 06.15 on your iPhone you wont ever be able to restore to stock firmware (it will fail). Youll need to only restore to custom IPSWs (then again, if youre unlocker you should already be doing that).4. There are reports that 06.15 may disable your GPS. The iPhone Dev-Team is currently working on a fix.

Dont update to 06.15 if you dont need to! Only do this if you need the unlock and youre stuck on 05.14 or 05.15, and youre willing to assume the above risks.

Step OneCreate a folder on your desktop called Pwnage

Download RedSn0w from here and place it in the Pwnage folder. Likewise, download the latest 4.2.1 firmware from below and place it in the same folder.

Extract the redsn0w executable from the RedSn0w zip file into the same folder.

Step TwoConnect your iPhone to the computer and launch iTunes.

Select your iPhone from the list of devices on the left. Now hold down Shift and click the Restore button. Restore is preferred as it won't create any wasted space on your iPhone.

Navigate to the Pwnage folder on your desktop and select the 4.2.1 firmware ipsw. Click the Choose button to continue.

Step ThreeOnce iTunes has finished updating your iPhone to the desired firmware open the Pwnage folder on your desktop and launch the redsn0w application from the redsn0w folder we extracted earlier.

Step FourOnce RedSn0w opens click the Browse button

Step FiveSelect the 4.2.1 firmware ipsw we placed in the Pwnage folder on our desktop then click Open.

Step SixOnce the firmware has been verified click the Next button to continue.

Step SevenRedSn0w will now prepare the jailbreak data

Step EightFrom this window you can select the jailbreak options you would like.

Verbose boot displays detailed information on boot of your device and is generally only needed by developers and advanced users.

Make sure Cydia is selected. For this tutorial we will also select Custom boot logo and Custom recovery logo.

When you click to select each custom logo option a dialog window will appear asking you to select the image. Locate the image you would like to use then press the Open button.

*Remember the rules for boot logos are: RGB or Grayscale format with Alpha channel and dimension below 320x480. If you would like to use the iClarified ones they can be found here: Boot Logo, Recovery Logo

Notice that RedSn0w can Enable multitasking, Enable homescreen wallpaper, and Enable battery percentage. If you do not need multitasking we would recommend deselecting it as it makes your iPhone 3G run very slow.

If you read the warning above and you would like to update your baseband to the 06.15 iPad version for unlock then check Install iPad Baseband. Click Yes when prompted to confirm your decision.

Click the Next button to continue

Step NinePlease plug your iPhone into the computer and make sure its OFF then click the Next button

Step TenRedSn0w will now guide you through the steps to get into DFU mode. You can find more help with DFU mode here

Hold down both the Home button and the Power button for 10 seconds.

Release the Power button and continue holding the Home button until RedSn0w detects the device.

Step ElevenRedSn0w will now downloaded the iPad baseband if needed and your iPhone will reboot

Step TwelveRedSn0w will then begin uploading the new RAM Disk and Kernel.

Step ThirteenOnce this is complete you will be notified that RedSn0w is done. Click the Finish button. When your iPhone finishes rebooting (5 minutes or so) it will be jailbroken with Cydia on the SpringBoard.

NOTES:If you have problems with RedSn0w on Windows Vista or Windows 7. Right click the executable and set it to run as administrator in Windows XP compatibility mode.

UNLOCK:You can now follow this tutorial if you want to unlock your device.

*As usual a big thanks to the iPhone Dev-Team for their hard work and contribution to the iPhone community.

For those users that are planning to Jailbreak on iOS 4.2.1 then I recommend adding this Cydia Source into Cydia after you jailbreak so you don't have to manually input all the Cydia Sources manually. This will automatically add all the best Cydia Sources and give you access to all the best Cydia Tweaks, Themes and Apps for FREE with just a push of a button. Follow the steps below.
1. Open Cydia
2. Tap Sources
3. Tap Edit
4. Tap Add
5. Type this url in the box (cydiasource,n e t) without the spaces and switch coma for a dot in the url.
6. Tap "Add Source"
7. Install the package labelled "All Sources".
This will give you all the best Cydia Sources to have access to all the best Tweaks, Apps and Themes for FREE.

Thank you so much, I successfully installed jailbreak on my iPhone 3G iOS 4.2.1.
Restore firmware with iTunes takes about 12 minutes until it asks to activate with a SIM card.
Note that I has issues with battery, so as soon as redsn0w finished I plugged the iphone to wall charger.to prevent yellow screen. It's mandatory to start firmware flashing with high battery.